Methods of managing timberland

ABSTRACT

A method of managing timberland to optimize the combined revenue of a softwood tree crop and an energy crop generally includes planting a softwood tree crop in adjacent first and second rows, wherein the softwood tree crop has a tree spacing between adjacent trees and a row spacing in the range of about 15 to about 25 feet between the first and second rows, planting an energy crop in the row spacing, wherein the energy crop is a regenerating lignocellulosic energy crop, and periodically harvesting the energy crop. Methods of managing timberland to optimize the plot growth rate for a plot including a softwood tree crop and an energy crop, and to optimize the total plot volume of a softwood tree crop and an energy crop are also provided.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.11/691,140, filed Mar. 26, 2007, which is incorporated herein byreference.

TECHNICAL FIELD

Embodiments of the present disclosure generally relate to methods ofmanaging timberland, and more specifically, to methods of managingtimberland using multiple lignocellulosic crops, such as a tree crop anda regenerating energy crop.

BACKGROUND

Many methods are practiced for managing timberland. The various methodsgenerally fall into specific categories of management practices, such asplantation management and natural stand management. Studies have shown,however, that desirable timberland management is achieved when trees areinitially spaced in rows having a selected row spacing that allows forlarge tree growth for the longer term trees in the plot, as well as theentry of equipment for the purpose of managing tree growth. In thatregard, adjacent trees within each row are initially spaced closer toone another to force straighter tree growth. These trees are laterpruned and thinned to provide a source of early income from the shorterterm trees and to promote enhanced lumber quality and value for thelonger term trees, in accordance with the forestry practices describedin U.S. Patent Application Publication No. 2004/0268428, filed on Jun.11, 2003, the disclosure of which is hereby incorporated by reference.

Alley cropping of trees and other crops, such as forages, landscapingplants, and agricultural crops, has also been practiced to improve theeconomic viability of the timberland during tree growth periods.However, there exists a need for an optimized method of managingtimberland for a combination of tree and regenerating energy crops.

SUMMARY

This summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This summary is not intended to identify key features ofthe claimed subject matter, nor is it intended to be used as an aid indetermining the scope of the claimed subject matter.

In accordance with one embodiment of the present disclosure, a method ofmanaging timberland to optimize the combined revenue of a softwood treecrop and an energy crop is provided. The method generally includesplanting a softwood tree crop in adjacent first and second rows, whereinthe softwood tree crop has a tree spacing between adjacent trees and arow spacing in the range of about 15 to about 25 feet between the firstand second rows. The method further includes planting an energy crop inthe row spacing, wherein the energy crop is a regeneratinglignocellulosic energy crop, and periodically harvesting the energycrop.

In accordance with another embodiment of the present disclosure, amethod of managing timberland to optimize the plot growth rate for aplot including a softwood tree crop and an energy crop is provided. Themethod generally includes planting a softwood tree crop in adjacentfirst and second rows, wherein the softwood tree crop has a tree spacingbetween adjacent trees and a row spacing between first and second rows.The method further includes planting an energy crop in the row spacing,wherein the energy crop is a regenerating lignocellulosic energy crop,and periodically measuring the plot growth of the softwood tree crop andthe energy crop.

In accordance with another embodiment of the present disclosure, amethod of managing timberland to optimize the total plot volume of asoftwood tree crop and an energy crop is provided. The method generallyincludes planting a softwood tree crop in adjacent first and secondrows, wherein the softwood tree crop has a tree spacing between adjacenttrees and a row spacing between the first and second rows. The methodfurther includes planting an energy crop in the row spacing, wherein theenergy crop is a regenerating lignocellulosic energy crop, andperiodically measuring the total plot volume of the softwood tree cropand the energy crop.

DESCRIPTION OF THE DRAWINGS

The foregoing aspects and many of the attendant advantages of thisdisclosure will become more readily appreciated by reference to thefollowing detailed description, when taken in conjunction with theaccompanying drawings, wherein:

FIG. 1 is a plan view of a representative embodiment of a plot of landplanted in accordance with the present disclosure having a tree crop andan energy crop;

FIG. 2 is a plan view of the plot of land of FIG. 1 after a firstpartial harvest of the tree crop;

FIG. 3 is a plan view of the plot of land of FIG. 1 after a secondpartial harvest of the tree crop;

FIG. 4 is a plan view of a second representative embodiment of a plot ofland planted in accordance with the present disclosure having first andsecond tree crops and first and second energy crops; and

FIG. 5 is a plan view of the plot of land of FIG. 4 after a firstpartial harvest of the first and second tree crops and plowing orshading out of the first energy crop.

DETAILED DESCRIPTION

Embodiments of the present disclosure are generally directed to methodsof managing timberland. A method of managing timberland in accordancewith one embodiment of the present disclosure may be best understood byreferring to FIG. 1, in which a plan view of a plot of land 10 is shown.The method generally includes planting a tree crop 20 in first andsecond rows 30 and 40 having a tree spacing 50 between adjacent treeswithin each row, and a row spacing 60 between the first and second rows30 and 40. The method further includes planting an energy crop 70 in therow spacing 60, wherein the energy crop 70 is planted within the samegrowing season as the tree crop 20.

The methods of managing timberland in accordance with the embodimentsdescribed herein align the cost of planting a long-term crop, such astrees, with the economic returns of harvesting a combination of tree andenergy crops. In that regard, the tree crop is harvested for woodproducts, including construction products, lumber, plywood, woodchips,pulp for cellulosic products, etc. The energy crop is a regeneratingcrop harvested for the production of heat, electric power, othercombustible power, and/or for conversion to transportation fuels andother useful energy products, such as ethanol. Therefore, methods inaccordance with the embodiments of the present disclosure includeperiodically harvesting the energy crop 70 for a predetermined number ofharvests, as well as harvesting the tree crop 20.

The tree crop includes trees in any growth state, including, but notlimited to, trees, tree seedlings, rooted cuttings, and tree seeds. As anon-limiting example, the tree crop may include a single species oftrees, for example, a single species of softwood or multiple species forforest diversity. As another non-limiting example, the tree crop mayinclude patterned plantings of several genetic crops of a singlespecies, as described in U.S. Patent Application Publication No.2004/0268428, filed on Jun. 11, 2003, the disclosure of which is herebyincorporated by reference. Planting multiple genetic crops in a plotcreates genetic diversity, which like forest diversity, helps to guardagainst losses from disease or insects.

Examples of suitable softwood trees include, but are not limited to, thefollowing: pine trees, such as loblolly pine, jack pine, Caribbean pine,lodgepole pine, shortleaf pine, slash pine, Honduran pine, Masson'spine, Sumatran pine, western white pine, egg-cone pine, logleaf pine,patula pine, maritime pine, ponderosa pine, Monterey pine, red pine,eastern white pine, Scots pine, araucaria tress; fir trees, such asDouglas fir; and hemlock trees, including any hybrids of any of theforegoing. Suitable softwood species for a plot of land managed inaccordance with the methods described herein are dependent upon desiredwood products, as well as environmental and geographic factors.

Examples of suitable hardwood trees include, but are not limited to, thefollowing: eucalyptus trees, such as Dunn's white gum, Tasmanianbluegum, rose gum, Sydney bluegum, Timor white gum, and the E.urograndis hybrid; populus trees, such as eastern cottonwood, bigtoothaspen, quaking aspen, and black cottonwood; and other hardwood trees,such as red alder, Sweetgum, tulip tree, Oregon ash, green ash, andwillow, including any hybrids of any of the foregoing. Suitable hardwoodspecies for a plot of land managed in accordance with the methodsdescribed herein are dependent upon desired wood products, as well asenvironmental and geographic factors.

Suitable energy crops are regenerating lignocellulosic energy crops,including perennial plant species such as switch grass (includingpanicum virgatum and other varieties of the genus panicum), miscanthus(including miscanthus giganteus and other varieties of the genusmiscanthus), giant reed (arundo donax), energy cane (saccharum spp.),and napier grass (pennisetum purpureum). These energy crops are grownfor the specific purpose of producing energy from all or part of theresulting plant. As non-limiting examples, switch grass and miscanthusare energy crops that regenerate naturally following a full periodicharvest, for example, an annual harvest. These energy crops are normallyharvested from the first or second year after planting, and the yieldsof the crop may continue to improve with each harvest until they leveloff around the fifth or sixth year. These crops also provide additionalenvironmental benefits to a plot of land, such as erosion control, soilorganic matter build-up, wildlife habitat, and potentially reducedfertilizer and pesticide requirements.

Once established, switch grass and miscanthus fields can be maintainedfor extended periods, but the advantages of new, higher yield varietiesmay warrant periodic replanting. In one embodiment, the regeneratingenergy crop is plowed and replanted every 6-12 years, after apredetermined number of harvests, e.g., 6-12 harvests if harvestedannually. In another embodiment, the regenerating energy crop is plowedand replanted every 7-11 years, after a predetermined number ofharvests, e.g., 7-11 harvests if harvested annually. In anotherembodiment, the regenerating energy crop is plowed and replanted every8-10 years, after a predetermined number of harvests, e.g., 8-10harvests if harvested annually. In yet another embodiment, theregenerating energy crop is plowed and replanted every 9 years, after apredetermined number of harvests, e.g., 9 harvests if harvestedannually.

Suitable energy crops in accordance with the present disclosure arecrops that can be compatibly planted with the tree crop when plantedduring the same growing season that the tree crop is planted. As anexample of non-compatible crops, studies have shown that hybrid poplaris too competitive when planted at the same time as black walnut,resulting in losses of black walnut trees at an early stage in thegrowing cycle. Therefore, for better results, black walnut is generallyplanted two to three years prior to alley-cropped poplar at double thedensity. See Miles Merwin, “Intercropping Black Walnut in Oregon'sWillamette Valley,” The Temperate Agroforester (1996), the disclosure ofwhich is herby incorporated by reference.

While the plot of land 10 in the illustrated embodiment of FIG. 1 isplanted with at least two crops: a tree crop 20 and an energy crop 70,it should be appreciated that planting the plot of land with more thantwo crops is also within the scope of the present disclosure.

The specific nature of the plot 10 and the distances for tree spacing 50and row spacing 60 is dependent upon a variety of factors, such as, butnot limited to, the type or types of trees being grown, the nature ofproducts desired from the trees, environmental conditions and impacts,hydrology, wildlife, biodiversity, sunlight restrictions due to treecrop growth, and the economics of balancing the harvest returns andcombined revenues of a combined tree and energy plot. It should beappreciated that the number of trees and the number of rows seen inFIGS. 1-3 are merely for illustrative purposes. In that regard, thenumber of trees in a row and the number of rows in a plot can beconfigured in a repeating pattern over any sized area, such as one ormore acres of land.

The tree spacing 50 is selected based on several factors, includingoptimizing the number of trees per plot area, and initially planting thetrees at far enough distances from one another to encourage growth, butat close enough distances to force straight, upward growth, as well asto provide a source of early income from subsequent tree thinning. Inone embodiment, the spacing between trees is about 4-6 feet. In anotherembodiment, the spacing between trees is about 5 feet. However, itshould be appreciated that spacing between trees reasonably above orbelow these ranges is within the scope of this disclosure. It shouldfurther be appreciated that the spacing between trees may increase overtime as the trees are thinned and/or partially harvested during thegrowth period, as best seen in FIGS. 2 and 3. The specifics of pruning,thinning, and partially harvesting the tree crop are discussed ingreater detail below.

The row spacing 60 is also selected based on multiple factors. Forexample, the row spacing 60 is selected to provide ample room for largemachinery and equipment to access the tree crop for the purpose ofmanaging tree growth and development without damaging the trees,specifically, during the fertilizing, vegetation and pest control,thinning, pruning, and harvesting processes. Further, the row spacing 60is selected to provide adequate spacing between trees in the laterstages of the tree life to promote larger growth trees having enhancedlumber quality and value. In addition, the row spacing 60 is selected tooptimize the combined revenues of the tree crop and the energy crop. Inthat regard, revenues are calculated based on predicted crop values.Moreover, row spacing 60 may be determined based on sunlightrestrictions on the plot of land 10 as a result of tree crop growth,such that adequate sunlight reaches the energy crop. Other row spacingoptimization considerations are also within the scope of the presentdisclosure and may include crop planting and growth management costs, aswell as environmental effects on the plot of land.

In one embodiment, the row spacing is between about 15 and about 25feet. In another embodiment, the row spacing is at least about 18 feet.In yet another embodiment, the row spacing is at least about 20 feet.However, it should be appreciated that row spacing reasonably above orbelow these ranges is within the scope of this disclosure.

The planting of the tree and energy crops may use single or multiplepass planting techniques. In accordance with the methods describedherein, a separate planting pass may be used for each crop planted,e.g., one pass for the tree crop and one pass for the energy crop. Inthat regard, the tree crop is planted at a first planting pass followedat a later time by interplanting the energy crop at a second plantingpass. Preferably, the tree crop is planted early in the planting seasonto optimize the chances of tree survival and early growth. The timing ofthe second planting pass is dependent upon the nature of the tree cropsplanted. However, it should be appreciated that both crops may beplanted in the same growing season to simplify planting and to maximizethe yields of the energy crop. Moreover, methods for simultaneousplanting of both tree and energy crops are also within the scope of thisdisclosure.

Once the crops have been planted, a variety of processes are used tomanage the growth and development of the tree and energy crops.Non-limiting examples of these processes include, alone or incombination, pruning, thinning, or applying any variety of fertilizer,herbicide, and/or pesticide. These processes may occur any number oftimes during growth and/or crop production. The timing of the variousprocesses to manage growth and development is variable and is preferablyaligned with the crop value. For example, pruning of the tree croppreferably occurs at a time when the final value of the tree crop may bemost improved, when the value of products derived from pruning ismaximized, or when the light and water available for the energy cropwill be improved to improve the value of the products derived from theenergy crop. By pruning, what is meant is the removal of branches topromote the growth of knot-free wood. As a non-limiting example, pruningof a softwood tree crop, such as loblolly pine, is typically done whenthe tree crop reaches a height of approximately 30 feet, which may fallanywhere between 8-14 years after planting. At that time, the tree limbsmay be pruned to a height of between 18-21 feet from the ground.

Embodiments of the present disclosure further include harvesting thetree crop and the energy crop. In the illustrated embodiment of FIGS.1-3, the tree crop is partially harvested before the final full harvest(see FIGS. 2 and 3). Partial harvesting of the tree crop in the plotprovides a source of early income from the shorter term trees andpromotes enhanced lumber quality and value for the longer term trees.Partial harvesting is done such that the final value of the tree cropwill be maximized. In that regard, partial harvesting may be performedfrom about 8 to about 14 years after planting, as seen in FIG. 2.Additional partial harvesting may be performed from about 5 to about 10years prior to the full harvest, as seen in FIG. 3.

Full harvesting of the remaining tree crop is performed at a time whenthe final value of the tree crop will be maximized. A softwood treecrop, such as loblolly pine, is typically fully harvested at about 27 toabout 30 years from planting. It should be appreciated that fullharvesting of the tree crop without an early partial harvesting is alsowithin the scope of the present disclosure.

Low density stands that result from pruning and harvesting in accordancewith the present disclosure present less risk to the timberlands fromreduced value growth and overstocking pressures, such as mortality,insect infestation (e.g., southern pine beetle) and the like.Additionally, the timing, amount and selection of fertilizers,herbicides, and/or pesticides employed are controlled to maximize valuereturned from the process.

Similarly, harvesting of the energy crop preferably occurs at a time orat multiple times when the value of products derived from the energycrop is high. In one embodiment, the energy crop is harvestedperiodically, for example, on an annual basis for a predetermined timeperiod, for example, nine years, as described above. At the end of thepredetermined number of harvests or years, the energy crop is plowed,and a second energy crop is replanted and harvested periodically foranother predetermined number of harvests or years. At the end of thesecond set of predetermined harvests or years, the second energy crop isplowed, and a third energy crop is replanted and harvested again foranother predetermined number of harvests or years. This pattern maycontinue until the tree crop is fully harvested, at which time the plotis cleared for starting anew with an initial planting of tree and energycrops.

Now referring to FIG. 4, a method of managing timberland in accordancewith other embodiments of the present disclosure will be described ingreater detail. The method is substantially identical in materials andoperation as the previously described embodiment, except for differencesregarding the row spacing and the energy crops grown in the row spacing,which will be described in greater detail below. For clarity in theensuing description, numeral references of like elements of the plot ofland 110 in FIGS. 4 and 5 are similar to the numeral references in theplot of land 10 in FIGS. 1-3, but in the 100 series.

Referring to FIG. 4, a method of managing timberland having non-uniformrow spacing between rows of trees is seen. Like the previously describedembodiments, the method includes planting a first tree crop 120 in firstand second rows 130 and 140 having a tree spacing 150 between adjacenttrees within each row and a first row spacing 160 between the first andsecond rows 130 and 140. The method further includes planting a firstenergy crop 170 in the first row spacing 160. Unlike the previouslydescribed embodiments, the method includes planting a second tree crop122 in a third row 180 having tree spacing 150 between adjacent trees,but having a second row spacing 190 between the second and third rows140 and 180 that is different from the first row spacing 160 between thefirst and second rows 130 and 140. The method further includes plantinga second energy crop 172 in the second row spacing 190.

It should be appreciated that the second energy crop 172 planted in thesecond row spacing 190 may be the same as or different than the firstenergy crop 170 planted in the first row spacing 160. Moreover, itshould be appreciated that the second tree crop 122 may be the same asor different than the first tree crop 120.

Like the first row spacing 160, discussed above with reference to FIGS.1-3, the second row spacing 190 is also a predetermined spacing based onthe factors discussed above, such as optimizing the combined revenues ofthe first and second tree crops 120 and 122 and the first and secondenergy crops 170 and 172. In that regard, the second row spacing 190 isat least the same as the first row spacing 160 to provide adequatespacing between rows of trees for tree growth and machinery entry, asdescribed above. However, depending on predicted crop values andcorresponding revenues to be generated by the sale of the crops, thesecond row spacing 190 may be greater than the first row spacing 160. Asa non-limiting example of the second row spacing 190 being greater thanthe first row spacing 160, the second row spacing 190 is at least 40feet. In other non-limiting examples, the second row spacing 190 is inthe range of about 30 feet to about 40 feet, in the range of about 40feet to about 60 feet, in the range of about 60 feet to about 80 feet,in the range of about 80 feet to about 100 feet, and in the range ofabout 100 feet to about 120 feet.

As discussed above with reference to plot 10, predicted revenues of thecombined crops may not be the only factor in determining the second rowspacing in plot 110. For example, other considerations for the secondrow spacing include crop planting and growth management costs, as wellas environmental effects on the plot of land. Moreover, while arepeating pattern of first row spacing 160 and second row spacing 190 isseen in the illustrated embodiment of FIG. 4, it should be appreciatedthat repeating, non-repeating, and other non-uniform row spacingpatterns are all within the scope of the present disclosure.

Like the embodiments described above, the first and second energy crops170 and 172 of this embodiment are also periodically harvested, forexample, annually harvested, for a first predetermined number ofharvests. However, in accordance with this embodiment, both of the firstand second energy crops 170 and 172 may not be replanted after a certainpredetermined number of harvests to allow for enhanced spacing aroundthe tree crops 120 and 122 thereby resulting in enhanced tree cropgrowth.

In addition to enhanced tree spacing, adequate sunlight for the energycrops 170 and 172 may become a factor in crop production after a certainnumber of years of tree crop growth. For example, if the tree crops 120and 122 provide substantial shade over the first row spacing 160, suchthat the first energy crop 170 does not receive adequate sunlight togrow for viable production, the first energy crop 170 can be removed,for example, plowed with the second energy crop 172 and not replantedor, in the alternative, shaded out by the tree crops 120 and 122 after acertain predetermined number of harvests. However, it should beappreciated that the second row spacing 190 is designed and configuredto receive adequate sunlight beyond the certain predetermined number ofharvests, despite tree crop growth, for periodic harvest throughout thelife of the tree crops in accordance with methods described herein.

As a non-limiting example, after the last of the first predeterminednumber of harvests, the first and second energy crops 170 and 172 areplowed, and a second planting of the second energy crop 172 isreplanted, as best seen in FIG. 5. The second planting of the secondenergy crop 172 is then periodically harvested for a secondpredetermined number of harvests. After the last of the secondpredetermined number of harvests, the second planting of the secondenergy crop 172 is plowed, and a third planting of the second energycrop 172 is replanted. The third planting of the second energy crop 172is then periodically harvested for a third predetermined number ofharvests. It should be appreciated, however, that the other plowing andreplanting schedules that align with desired plot conditions foroptimized tree and energy crops are also within the scope of the presentdisclosure.

The following examples are representative annual schedules for managingplots of land in accordance with embodiments described herein. EXAMPLE 1concerns a plot of land having uniform row spacing, in accordance withthe illustrated embodiment of FIGS. 1-3. EXAMPLE 2 concerns a plot ofland having non-uniform row spacing, in accordance with the illustratedembodiment of FIGS. 4 and 5.

EXAMPLE 1

In accordance with the illustrated embodiment of FIGS. 1-3, TABLE 1represents an exemplary annual schedule for managing a plot of landhaving a tree crop and an energy crop. At year 0, the tree crop and theenergy crop are planted within the same growing season. During years1-9, the energy crop is annually harvested. At year 10, the energy cropis plowed and replanted. During years 11-18, the energy crop is annuallyharvested. At year 19, the energy crop is plowed and replanted. Duringyears 10-27, the energy crop is annually harvested.

Meanwhile, at year 1, the tree crop is subjected to vegetation and/orpest control, which may include applying any variety of fertilizer,herbicide, or pesticide, as described above. At year 11, the tree cropis pruned. At years 12 and 23, the tree crop is partially harvested orthinned. At year 27, the remainder of the tree crop is fully harvested.After year 27, the plot can be cleared and replanted. It should beappreciated that vegetation and/or pest control, pruning, thinning,fertilization, and/or harvesting (both partial and full) may take placeduring any one or more years of this schedule for both the tree crop andthe energy crop, as deemed necessary for optimizing plot growth.

TABLE 1 EXEMPLARY SCHEDULE FOR FIGS. 1-3 EXAMPLE 2 Year Tree Crop EnergyCrop 0 --plant-- --plant-- 1 veg/pest control harvest 2 harvest 3harvest 4 harvest 5 harvest 6 harvest 7 harvest 8 harvest 9 harvest 10--plow and replant-- 11 --prune-- harvest 12 --partial harvest-- harvest13 harvest 14 harvest 15 harvest 16 harvest 17 harvest 18 harvest 19--plow and replant-- 20 harvest 21 harvest 22 harvest 23 --partialharvest-- harvest 24 harvest 25 harvest 26 harvest 27 --full harvest--harvest

In accordance with the illustrated embodiment of FIG. 4, TABLE 2represents an exemplary annual schedule for managing a plot of landhaving a tree crop, assuming the first and second tree crops aresubjected to the same planting and management schedules, and first andsecond energy crops, assuming the first and second energy crops are thesame or similar types of regenerating lignocellulosic energy croprequiring similar planting and management schedules.

At year 0, the tree crops and the energy crops are planted. During years1-9, the energy crops are annually harvested. At year 10, the energycrops are plowed and only the second energy crop is replanted. It shouldbe appreciated, however, that resources need not be spent on plowing thefirst energy crop. Instead, the first energy crop can be shaded out ofproduction by the tree crops, as described above. During years 11-18,the second energy crop is annually harvested. At year 19, the secondenergy crop is plowed and replanted. During years 10-27, the secondenergy crop is annually harvested.

Meanwhile, at year 1, the tree crops are subjected to vegetation and/orpest control, which may include applying any variety of fertilizer,herbicide, or pesticide, as described above. At year 11, the tree cropis pruned. At years 12 and 23, the tree crop is partially harvested orthinned. At year 27, the remainder of the tree crop is fully harvested.After year 27, the plot can be cleared and replanted. In this example,it should also be appreciated that vegetation and/or pest control,pruning, thinning, fertilization, and/or harvesting (both partial andfull) may take place during any one or more years of this schedule forboth the tree crops and the energy crops, as deemed necessary foroptimizing plot growth.

TABLE 2 EXEMPLARY SCHEDULE FOR FIG. 4 While illustrative embodimentshave been illustrated and described, it will be appreciated that variouschanges can be made therein without departing from the spirit and scopeof the disclosure. First and Second First Energy Second Energy Year TreeCrop Crop Crop 0 --plant-- --plant-- --plant-- 1 veg/pest controlharvest harvest 2 harvest harvest 3 harvest harvest 4 harvest harvest 5harvest harvest 6 harvest harvest 7 harvest harvest 8 harvest harvest 9harvest harvest 10 --plow or --plow and shade out-- replant-- 11--prune-- harvest 12 --partial harvest-- harvest 13 harvest 14 harvest15 harvest 16 harvest 17 harvest 18 harvest 19 --plow and replant-- 20harvest 21 harvest 22 harvest 23 --partial harvest-- harvest 24 harvest25 harvest 26 harvest 27 --full harvest-- harvest

The embodiments of the disclosure in which an exclusive property orprivilege is claimed are defined as follows:
 1. A method of managingtimberland to optimize the combined revenue of a softwood tree crop andan energy crop, comprising: (a) planting a softwood tree crop inadjacent first and second rows, wherein the softwood tree crop has atree spacing between adjacent trees and a row spacing in the range ofabout 15 to about 25 feet between the first and second rows; (b)planting an energy crop in the row spacing, wherein the energy crop is aregenerating lignocellulosic energy crop; and (c) periodicallyharvesting the energy crop.
 2. The method of claim 1, wherein the energycrop is planted within the same growing season as the softwood treecrop.
 3. The method of claim 1, wherein the energy crop is harvested atleast annually.
 4. The method of claim 1, wherein the energy crop isharvested in the range of 6-12 harvest.
 5. The method of claim 1,wherein the softwood tree crop is selected from the group consisting ofpine trees, araucaria trees, fir trees, and hemlock trees.
 6. The methodof claim 1, wherein the energy crop is selected from the groupconsisting of switch grass, miscanthus, giant reed, energy cane, andnapier grass.
 7. The method of claim 1, wherein the tree spacing is atleast about 5 feet.
 8. The method of claim 1, further comprisingpartially harvesting a portion of the softwood tree crop such that thefinal value of the softwood tree crop will be maximized and harvestingthe remainder of the softwood tree crop at a time when the final valueof the softwood tree crop will be maximized.